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Finding the Fourth Proportional to 640.67, 883.80 and 430.90

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Solution

The fourth proportional to 640.67, 883.80 and 430.90 is: 594.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.67 : 883.80 = 430.90 : x
  2. Step 2: Convert to fraction form
    640.67/883.80 = 430.90/x
  3. Step 3: Cross multiply
    640.67x = 883.80 × 430.90
  4. Step 4: Simplify right side
    640.67x = 380,829.42
  5. Step 5: Solve for x
    x = 380,829.42/640.67
  6. Step 6: Final answer
    x = 594.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.